1890091057 has 2 divisors, whose sum is σ = 1890091058. Its totient is φ = 1890091056.

The previous prime is 1890090977. The next prime is 1890091069. The reversal of 1890091057 is 7501900981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1542604176 + 347486881 = 39276^2 + 18641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1890091057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1890031057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945045528 + 945045529.

It is an arithmetic number, because the mean of its divisors is an integer number (945045529).

Almost surely, 2^1890091057 is an apocalyptic number.

It is an amenable number.

1890091057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890091057 is an equidigital number, since it uses as much as digits as its factorization.

1890091057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 1890091057 is about 43475.1774809488. The cubic root of 1890091057 is about 1236.4054452785.

The spelling of 1890091057 in words is "one billion, eight hundred ninety million, ninety-one thousand, fifty-seven".